. Il potere di movimento nelle piante . Piante; Botanica. Cap. VII. Sonno di foglie. 379 sebbene il corretto ordine dei loro movimenti in relazione al giorno e notte era totalmente perso. Così, una foglia discese durante le prime due notti (ossia tra le ore 22.00 e le ore 7 del mattino successivo mattino- ing) invece di ascendente, e la terza notte è spostata principalmente in una direzione laterale. La seconda foglia si è comportata in modo altrettanto modo anomalo, muovendosi lateralmente durante la notte iirst, fortemente decrescente durante la seconda e la crescente per un inusuale altezza durante la terza notte. Con piante e mantenuta a una temperatura elevata a

• Collaboratore: The Book Worm / Alamy Foto Stock
• ID dell’immagine: RDG06K
• Dimensioni dei file: 7,1 MB (194,7 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 1943 x 1286 px | 32,9 x 21,8 cm | 13 x 8,6 inches | 150dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. The power of movement in plants . Plants; Botany. Chap. VII. SLEEP OF LEAVES. 379 although the proper order of their movements in relation to the day and night was wholly lost. Thus, one leaf descended during the first two nights (i.e. between 10 p.m. and 7 a.m. next morn- ing) instead of ascending, and on the third night it moved chiefly in a lateral direction. The second leaf behaved in an equally abnormal manner, moving laterally during the iirst night, descending greatly during the second, and ascending to an unusual height during the third night. With plants kept at a high temperature and exposed to the light, the most rapid circumnutating movement of the apex of a leaf which was observed, amounted to -g^ of an inch in one second; and this would have equalled J- of an inch in a minute, had not the leaf occasionally stood still. The actual distance travelled by the apex (as ascertained by a measure placed close to the leaf) was on one occasion nearly f of an inch in a vertical direction in 15 m.; and on another occasion f of an inch in 60 m.; but there was also some lateral movement. Mimosa alUda*—The leaves of this plant, one of which is here figured (Fig. 159) reduced to f of the natural size, present some Fig. 159.. Mimosa albida ; leaf seen from vertioally above. interesting peculiarities. It consists of a long petiole bearing only two pinnsB (here represented as rather more divergent than is usual), each with two pairs of leaflets. But the inner * Mr. Tliistleton Dyer infoiins us that this Peruvian plant (which was sent to us from Kew) is con- sidered by Mr. Bentham (' Traue. Linn. Soc., ' vol. xxx. p. 390) to be " the species or variety whieli mnst commonly represents the M. sensitiva of our gardens.". Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Darwin, Charles, 1809-18

Parole chiave associate all'immagine

• bookcentury1800
• booksubjectbotany
• booksubjectplants
• bookyear18